A leaked 911 call has revealed the moment an onlooker summoned police after witnessing Nicolas Cage's now infamous drunken evening last month.

On the recording a witness can be heard reporting the fracas to the New Orleans police.

During the call, the woman tells authorities that she has serious concerns for the 47-year-old actor's wife Alice Kim, and their five-year-old son Kal-El, who Cage reportedly dropped during the argument.

Emergency call: An onlooker called 911 after witnessing Nicolas Cage's now infamous drunken evening last month, where the 47-year-old actor was accused of endangering his son Kal-El (file picture)

Making the call from the French Quarter of the Louisianan city, the witness is heard telling the operator: 'There’s a terrible emergency going on across the street involving a child, a man that’s out of control screaming 'let me in! let me in!'

'He’s holding a baby... I think he’s trying to take it from its mother.'

Panicking, she tells the police she believes he is going to hurt the child while he argues with his wife.

Mug shot: The 47-year-old actor was taken into custody on April 16 after he got into a fight with his wife Alice Kim in New Orleans

'They are screaming and screaming and I think this man is going to hurt this child,' she says in the recording, released on celebrity news website TMZ.

She goes on to tell the operator that the child is visibly distressed.

'The child is screaming. It is a very very bad scene.'

After April 16, Cage was arrested for allegedly grabbing his wife and disturbing the peace.

But the New Orleans District Attorney's Office later decided to not press charges against Cage as investigators did not have enough evidence to move forward with the case.

Cleared: All charges against Cage were dropped who rowed with wide Kim, pictured here in November

People magazine reported last week that the actor would not face any charges over the incident.

It quoted his attorney as saying that charges of domestic abuse battery, disturbing the peace and public drunkenness had been dropped.

The New Orleans District Attorney confirmed that no charges of any kind will be pursued against him,' Harry Rosenberg told the magazine.

'After their investigation, the DAs refused all charges against Nick and the matter has been closed.'

During the arrest Cage allegedly assaulted his wife and the New Orleans police report also claimed that Cage dropped his son, prompting a child abuse detective to be called.

His wife Alice told police she and Cage had been rowing on the night 'due to his intoxicated state' when they went to collect their son from a friend's house.

She said the argument continued until they arrived home, at which point Cage dropped Kal-El, TMZ.com reports.

The report reads: 'At some point, Mr Cage fell while holding their son. The fall caused the five year old child to suffer a minor abrasion to his left knee, and she [Alice] then recovered the child.'

Another witness, it is reported, described a different story, saying he saw Cage 'pull the male child to the ground by his hand'.

The report went on to note that a 'child abuse detective was notified'.

Alice refused police permission to interview their son - but a photograph of the injury was taken.

The child abuse detective decided no further action was required - but said a representative of the Child Protection Service may be contacted and could possibly launch an investigation themselves.

Police described Cage as 'hysterical' and 'irrational' when they interviewed him after the incident.

The public argument occurred after the couple turned up to a New Orleans tattoo parlour.

CCTV footage of the pair with friends shows an intoxicated Cage arguing with staff and pointing his finger at them.

He stumbled into the New Orleans parlour and sources have told TMZ.com that as well as demanding a piece of body art he was also throwing his clothes around.